Also: One man's trash is another man's treasure.
Meaning: To be so poor as to be forced to live off the discards of others.
Matt 15:27 And she said, Truth, Lord: yet the dogs eat of the crumbs which fall from their masters' table.
Luke 16:21 And desiring to be fed with the crumbs which fell from the rich man's table: moreover the dogs came and licked his sores.